Aftermarket Impeller Kit with Key for Yamaha 2-Stroke and 4-Stroke Outboards – 40–70 HP, Replaces 697-44352-00-00 and 6H3-44352-00-00

Product Details

This aftermarket water pump impeller kit with key is supplied for selected Yamaha 2-stroke and 4-stroke outboards. The package contains one rubber water pump impeller and one matching drive key for replacing a worn impeller during routine cooling-system service.

The company catalog identifies this product under SKU UK17IY002 and lists it for the Yamaha applications shown below. Catalog references include Yamaha OEM numbers 697-44352-00-00 and 6H3-44352-00-00, with aftermarket reference numbers 18-3069 (Sierra Marine) and 9-45602 (Mallory Marine).

• Includes one water pump impeller and one drive key
• Listed for selected Yamaha 2-stroke and 4-stroke outboards from 40 HP through 70 HP
• Designed as an aftermarket replacement for the listed reference numbers
• Verify the complete engine model, year, shaft configuration and serial range before ordering

Part Number Matrix

These numbers are reference and interchange identifiers associated with this product listing. They are not a substitute for confirming the exact engine application.

Engine and Model Compatibility

The company fitment records identify the following Yamaha models. A model name or horsepower rating alone does not confirm fitment; compare your complete model designation and serial information with the engine manufacturer’s parts information.

Yamaha 2-Stroke Applications

Yamaha 4-Stroke Applications

Technical Specifications

Product type

Aftermarket water pump impeller kit with drive key

Application

Selected Yamaha 2-stroke and 4-stroke outboards listed above

Horsepower range

40–70 HP, subject to the specific model and application

OEM references

697-44352-00-00 and 6H3-44352-00-00

Aftermarket references

Sierra Marine 18-3069 and Mallory Marine 9-45602

Included key

One drive key for securing the impeller to the water-pump shaft

What's in the Box

• One aftermarket rubber water pump impeller
• One matching impeller drive key

This listing is for the impeller-and-key kit only. A water-pump housing, wear plate, cup, gaskets, O-rings and other water-pump components are not listed as included unless separately stated for your order.

Installation Notes

1. Confirm the replacement number and engine application before disassembly. Disconnect the battery and follow the service procedure for your specific outboard.
2. Remove the lower unit or water-pump cover as required by the engine manufacturer’s instructions.
3. Remove the old impeller and take out the old drive key from the shaft keyway.
4. Inspect the pump housing, wear surfaces, shaft, keyway and related seals for scoring, corrosion or debris. Replace damaged components before reassembly.
5. Install the supplied drive key fully in the shaft keyway.
6. Lubricate the new impeller with clean water or a lubricant approved for water-pump impeller installation. Do not use petroleum-based products that may damage the rubber.
7. Fit the impeller over the key and shaft, bending the vanes in the correct direction of rotation for your engine.
8. Reinstall the pump cover and any removed gaskets, O-rings or fasteners according to the manufacturer’s specifications. The kit does not include those parts unless stated above.
9. Complete a water test using the correct supply method for your engine and confirm a steady cooling-water tell-tale stream.
10. Stop the engine immediately if the engine overheats, the tell-tale stream is absent or abnormal, or any leak is observed.

Maintenance and Troubleshooting FAQ

How do I know if the impeller needs replacement?

Common symptoms include overheating, a weak or missing tell-tale stream, fluctuating cooling-water flow, or damaged, cracked, stiff or missing impeller vanes found during inspection. Follow the maintenance interval specified for your engine and inspect the impeller whenever cooling performance is in doubt.

Does this kit fit both 2-stroke and 4-stroke Yamaha outboards?

Yes, the company catalog lists this SKU for selected Yamaha 2-stroke and 4-stroke models. The two engine types use different model and year conditions, so confirm your exact model designation against the applicable table before ordering.

What is the included key used for?

The drive key locks the impeller to the water-pump shaft so the shaft can rotate the impeller. Install it fully in the shaft keyway and do not reuse a damaged or deformed key.

Does the kit include a complete water-pump repair kit?

No. This SKU is an impeller kit with one key. It does not include a housing, wear plate, cup, gaskets, O-rings, seals or bolts unless those items are specifically stated in the order details.

Can I use this part in saltwater?

The company record does not specify a separate freshwater or saltwater rating. Confirm the application and follow your outboard manufacturer’s flushing and maintenance procedures after saltwater operation.

What should I do if the new impeller does not fit?

Do not force the part. Stop installation and compare the old impeller, drive key, shaft keyway and pump housing. Recheck the complete engine model, year and serial information against the correct parts catalog.

Is this an OEM Yamaha part?

No. This is an aftermarket replacement kit. Yamaha and other manufacturer names and part numbers are used only to identify application and reference compatibility.

Safety and Important Information

• Verify the complete engine model, year, shaft configuration and serial range before purchase.
• Do not rely on horsepower alone to determine fitment.
• Inspect the pump housing and related components before installing a new impeller.
• Use the service manual for your exact engine for torque values, rotation direction and lower-unit procedures.
• This is an aftermarket replacement, not an OEM Yamaha component.
• Professional installation is recommended when the cooling system or lower unit requires service.

About Sea Sierra

• We supply aftermarket marine replacement parts for routine maintenance and repair applications.
• Each listing is organized by product reference numbers and documented engine applications where available.
• For the best fitment result, compare the old part number and the complete engine identification before ordering.